class Error(Exception):
    pass


class UserNotFoundException(Error):
    def __init__(self, message):
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f"UserNotFoundException: {self.message}"


class UserTokenNotFoundException(Error):
    def __init__(self, message):
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f"UserNotFoundException: {self.message}"


class UserTokenExpirationException(Error):
    def __init__(self, message):
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f"UserTokenExpirationException: {self.message}"


class CaseNotFoundException(Error):
    def __init__(self, message):
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f"CaseNotFoundException: {self.message}"


class PlanNotFoundException(Error):
    def __init__(self, message):
        self.message = message
        super().__init__(self.message)

    def __str__(self):
        return f"PlanNotFoundException: {self.message}"
